Revert of Remove WindowFocusAllowedIndicator and associated code.

public/web/WebScopedWindowFocusAllowedIndicator.h

Index: public/web/WebScopedWindowFocusAllowedIndicator.h
diff --git a/public/web/WebScopedWindowFocusAllowedIndicator.h b/public/web/WebScopedWindowFocusAllowedIndicator.h
index 2a020b50233ce4bdcd4e94da2f5dd5748c10e491..36cbe9439e6ae87c83e11df1fd27641df0d2e58c 100644
--- a/public/web/WebScopedWindowFocusAllowedIndicator.h
+++ b/public/web/WebScopedWindowFocusAllowedIndicator.h
@@ -37,16 +37,24 @@
 
 class ScopedWindowFocusAllowedIndicator;
 class WebDocument;
+class WindowFocusAllowedIndicator;
 
 class WebScopedWindowFocusAllowedIndicator {
 public:
     explicit WebScopedWindowFocusAllowedIndicator(WebDocument* document) { initialize(document); }
+    // FIXME: this constructor is now deprecated. It will be removed as part of
+    // https://crbug.com/440740
+    WebScopedWindowFocusAllowedIndicator() { initialize(); }
     ~WebScopedWindowFocusAllowedIndicator() { reset(); }
 
 private:
     BLINK_EXPORT void initialize(WebDocument*);
+    BLINK_EXPORT void initialize();
     BLINK_EXPORT void reset();
 
+    // FIXME: m_indicator is now deprecated. It will be removed as part of
+    // https://crbug.com/440740
+    WebPrivateOwnPtr<WindowFocusAllowedIndicator> m_indicator;
     WebPrivateOwnPtr<ScopedWindowFocusAllowedIndicator> m_private;
 };